Any way to get a multilayer video?
First render out your animation with the OpenExr Multilayer setting, into an image sequence.



Then load the image sequence into the compositor (can be on a separate blender instance), with the Input -&gt; Image Sequence node



Do whatever composite you desire.



Then in the Output properties tab, set your frame start and end, then change the output format to ffmpeg video. Open up the encoding tab that appears, and change the container and encoding settings to what you want.



Render the animation (Ctrl + F12) (find the output video file in the folder specified under Output. It should be named something like 0001-0250.mkv or similar)